Method of ornamenting stone



July 8 1924. 1,500,272

R. G. SANBORN ET AL METHOD OF ORNAMENTING STONE Filed June 23 1923 firm rams QM frame WW M Patented y a, was.

ROBERT GEEENLEAF SANBORN AN D FREDERICK HASLAM, F NORTEFIELD, i'

ASSIQNOES T0 E. A. CHASE GRANITE COMPANY, OF NORTHFIELD, VERMONT.

MONT,

METHOD OF ORNAMENTING STONE.

a lication filed June 23,

To all whom it may concern:

Be it known that we, ROBERT G. SANBORN and FREDERICK HASLAM, both citize s of the United States, residing at Northfield, in the county of Washington and State of Vermont, have invented a new and useful Method of Ornamenting Stone, of which the following is a specification.

This invention relates to a method of 1c producing an ornamental design on a surface of granite or other similar material. It has been heretofore customary to produce such designs upon granite by cutting the design into the face of the stone, so that the design 1 appears depressed below the normal surface of the stone. It has not heretofore been considered desirable or practical to produce a design by the alternative process of cutting away the background and leaving the design at the original surface level, for the reason that the flat surfaces in the background, when produced by the usual sand blast, were entirely without distinctive character and did not produce a pleasing efiect i It is the object of our invention to provide a new and improvedprocess' of producing such ornamental designs upon stone surfaces b the use of which recess a distinctive and pleasing background can be provided, without substantial increase in either the cost or the labor of producing the design.

One result of our improved process or method is shown in the drawings in which- Fig. 1 is a face or plan view of a portion of a design produced by our improved method;

Fig. 2 is a. plan view of a portion of a screen, the use of which will be hereinafter ex lained; and

igs. 3 and4 aresectional views, taken along the lines 3-3 and 4-4: in Fig. 1.

In the drawings we have shown a slab orblock 10 of granite or other similar material onv one face of which a design has been produced by our new process.

In carrying outour improved process, a. block of stone is rovided, havin a smooth and usuall polis ed surface an a coatin of a wax-1i e resistant material is first place on this smooth surface. After this coating has become firmly affixed to the stone, a selected design is traced upon the surface 1923. Serial no. 647,404.

of the protective coating and all portions of the coating material covering the back; ground of the design are carefully removed, the remaining wax representing simply the design itself and the outside limits of the background. A. sand blast is then directed against the stone in the usual manner. The

particles of sand rebound harmlessly from of the sand blast and preferably closely adjacent the face of the stone. This screen may be of ordinary coarse mesh galvanized wire cloth, as indicated in Fig. 2, or may be of any other design or structure which appears desirable. The cross wires may be omitted to provide a screen with wires extending in one direction only, or the openings may be made circular or diamond shape in outline or may be otherwise varied to produce diiferent ornamental efiects.

The screen being placed in position, the sand blast is again directed against the tone, and the portions of the stonewhich are not in line with the wires of the screen are sunk quickly to a greater depth, while those portions protected by the wires are 7 very little efiected by this second application of the sand blast. v a

After the background has thus been given a distinctive appearance, the wax may be removed from the surface of the design and the blast may be again'applied for a very brief interval to remove the polish from the design, if it is desired to give the face of the design a dull finish instead of a polished finish. r

The results obtained by the use of our improved process are well illustrated in the example shown in Fig. 1 in which the distinctive background produces a very pleasing effect upon the observer and sets ed the design in a manner quite different from anything heretofore produced by mechanical processes.

The section ,of Fig. 3 is taken at a point protected by one of the wires of the screen the advanta es thereof, it will be evident that man c anges in the form and position oftie screen may be made by those skilled in the art within the scope of our invention as set forth in the claims and we do not wish to be otherwise limitedt'o the details herein disclosed, but what We claim 1. The method of producing a recessed surface on a block of stone which consists in cutting away a part of the stone by a blast of abrasive, interposing a screen in the path of the abrasive, and thereafter cutting away additional stone with the blast directed through the screen, thereby substantially reproducing the formation of the screen on the face of said recessed portion.

2. The method of producing an ornamental design on a surface of stone which consists in coating the stone with a resistant material, removing said resistant material from those portions of the surface representing the background of the design, cutting away the unprotected background with a blast of abrasive material, interposing a screen in the path of the abrasive, and cutmo em ting the background to an increased depth with said screen thus positioned.

3. The method of producing an ornamental design on a surface of stone which consists in coating the stone with a resistant material, removing said resistant material from those portions of the surface representing the background of the design, cuttin away the unprotected background with ab l ast of abrasive material, placing a screen against the face of the design, and thereafter directing the blast of abrasive against the background through said screen.

4. The 'method of producing an ornamental design on a surface of stone which consists in coating the stone with a resistant material, removing said resistant material from those portions of the surface repre senting the background of the design, cutting away the unprotected background with a blast of abrasive -material, placing a screen against the face of the design, directing the blast of abrasive against the background through said screen, removing the coating from the design, and directing the sand blast for a third but brief interval against the stone surface and the design.

In testimony whereof we have hereunto afiixed our signatures.

ROBERT GREENLEAF FREDERICK HASLAH.

seasons. 

